that's paul vance from the connecticut state police. before that, dan malloy, the governor of the state offering an update on the tragedy by today. it's a quaint new england town. seeing the pictures of children leaving sandy hook elementary, hard not to think of past school shootings in the country. one of the worst, of course, columbine high school in colorado. dave cullen spent ten years writing and researching about that massacre and joins us now. dave, thank you for being here. i guess your book came out about columbine ten years after the tragedy and the most eye opening thing about what you're reporting found was that all of the -- everything we thought we knew about columbine in the first week, two months and months after it happened was basically false and a lot of false narratives. and you basically searched for a sort of satisfying motive that we could all understand and you couldn't really find one. i wonder based of your experience if there are lessons to keep in mind piecing together what happened here in newtown in the we